1055 lines
28 KiB
C
1055 lines
28 KiB
C
/*
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* arch/s390/kernel/setup.c
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*
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* S390 version
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* Copyright (C) IBM Corp. 1999,2010
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "arch/i386/kernel/setup.c"
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* Copyright (C) 1995, Linus Torvalds
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*/
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/*
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* This file handles the architecture-dependent parts of initialization
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*/
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#define KMSG_COMPONENT "setup"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/bootmem.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/kernel_stat.h>
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#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/pfn.h>
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#include <linux/ctype.h>
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#include <linux/reboot.h>
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#include <linux/topology.h>
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#include <linux/ftrace.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <linux/memory.h>
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#include <asm/ipl.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/smp.h>
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#include <asm/mmu_context.h>
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#include <asm/cpcmd.h>
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#include <asm/lowcore.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/sections.h>
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#include <asm/ebcdic.h>
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#include <asm/compat.h>
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#include <asm/kvm_virtio.h>
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#include <asm/diag.h>
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long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
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PSW_MASK_EA | PSW_MASK_BA;
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long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
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PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
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PSW_MASK_PSTATE | PSW_ASC_HOME;
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/*
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* User copy operations.
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*/
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struct uaccess_ops uaccess;
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EXPORT_SYMBOL(uaccess);
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/*
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* Machine setup..
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*/
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unsigned int console_mode = 0;
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EXPORT_SYMBOL(console_mode);
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unsigned int console_devno = -1;
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EXPORT_SYMBOL(console_devno);
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unsigned int console_irq = -1;
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EXPORT_SYMBOL(console_irq);
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unsigned long elf_hwcap = 0;
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char elf_platform[ELF_PLATFORM_SIZE];
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struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
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int __initdata memory_end_set;
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unsigned long __initdata memory_end;
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/* An array with a pointer to the lowcore of every CPU. */
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struct _lowcore *lowcore_ptr[NR_CPUS];
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EXPORT_SYMBOL(lowcore_ptr);
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/*
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* This is set up by the setup-routine at boot-time
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* for S390 need to find out, what we have to setup
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* using address 0x10400 ...
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*/
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#include <asm/setup.h>
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/*
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* condev= and conmode= setup parameter.
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*/
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static int __init condev_setup(char *str)
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{
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int vdev;
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vdev = simple_strtoul(str, &str, 0);
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if (vdev >= 0 && vdev < 65536) {
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console_devno = vdev;
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console_irq = -1;
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}
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return 1;
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}
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__setup("condev=", condev_setup);
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static void __init set_preferred_console(void)
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{
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if (MACHINE_IS_KVM)
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add_preferred_console("hvc", 0, NULL);
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else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
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add_preferred_console("ttyS", 0, NULL);
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else if (CONSOLE_IS_3270)
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add_preferred_console("tty3270", 0, NULL);
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}
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static int __init conmode_setup(char *str)
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{
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
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SET_CONSOLE_SCLP;
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#endif
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#if defined(CONFIG_TN3215_CONSOLE)
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if (strncmp(str, "3215", 5) == 0)
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SET_CONSOLE_3215;
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#endif
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#if defined(CONFIG_TN3270_CONSOLE)
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if (strncmp(str, "3270", 5) == 0)
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SET_CONSOLE_3270;
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#endif
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set_preferred_console();
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return 1;
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}
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__setup("conmode=", conmode_setup);
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static void __init conmode_default(void)
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{
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char query_buffer[1024];
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char *ptr;
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if (MACHINE_IS_VM) {
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cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
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console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
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ptr = strstr(query_buffer, "SUBCHANNEL =");
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console_irq = simple_strtoul(ptr + 13, NULL, 16);
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cpcmd("QUERY TERM", query_buffer, 1024, NULL);
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ptr = strstr(query_buffer, "CONMODE");
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/*
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* Set the conmode to 3215 so that the device recognition
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* will set the cu_type of the console to 3215. If the
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* conmode is 3270 and we don't set it back then both
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* 3215 and the 3270 driver will try to access the console
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* device (3215 as console and 3270 as normal tty).
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*/
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cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
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if (ptr == NULL) {
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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return;
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}
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if (strncmp(ptr + 8, "3270", 4) == 0) {
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#if defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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} else if (strncmp(ptr + 8, "3215", 4) == 0) {
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#if defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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} else {
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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}
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#ifdef CONFIG_ZFCPDUMP
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static void __init setup_zfcpdump(unsigned int console_devno)
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{
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static char str[41];
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if (ipl_info.type != IPL_TYPE_FCP_DUMP)
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return;
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if (OLDMEM_BASE)
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return;
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if (console_devno != -1)
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sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
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ipl_info.data.fcp.dev_id.devno, console_devno);
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else
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sprintf(str, " cio_ignore=all,!0.0.%04x",
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ipl_info.data.fcp.dev_id.devno);
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strcat(boot_command_line, str);
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console_loglevel = 2;
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}
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#else
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static inline void setup_zfcpdump(unsigned int console_devno) {}
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#endif /* CONFIG_ZFCPDUMP */
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/*
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* Reboot, halt and power_off stubs. They just call _machine_restart,
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* _machine_halt or _machine_power_off.
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*/
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void machine_restart(char *command)
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{
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if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_restart(command);
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}
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void machine_halt(void)
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{
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if (!in_interrupt() || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_halt();
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}
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void machine_power_off(void)
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{
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if (!in_interrupt() || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_power_off();
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}
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/*
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* Dummy power off function.
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*/
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void (*pm_power_off)(void) = machine_power_off;
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static int __init early_parse_mem(char *p)
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{
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memory_end = memparse(p, &p);
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memory_end_set = 1;
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return 0;
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}
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early_param("mem", early_parse_mem);
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unsigned int user_mode = HOME_SPACE_MODE;
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EXPORT_SYMBOL_GPL(user_mode);
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static int set_amode_primary(void)
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{
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psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
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psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
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#ifdef CONFIG_COMPAT
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psw32_user_bits =
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(psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
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#endif
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if (MACHINE_HAS_MVCOS) {
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memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
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return 1;
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} else {
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memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
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return 0;
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}
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}
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/*
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* Switch kernel/user addressing modes?
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*/
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static int __init early_parse_switch_amode(char *p)
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{
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user_mode = PRIMARY_SPACE_MODE;
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return 0;
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}
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early_param("switch_amode", early_parse_switch_amode);
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static int __init early_parse_user_mode(char *p)
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{
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if (p && strcmp(p, "primary") == 0)
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user_mode = PRIMARY_SPACE_MODE;
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else if (!p || strcmp(p, "home") == 0)
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user_mode = HOME_SPACE_MODE;
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else
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return 1;
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return 0;
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}
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early_param("user_mode", early_parse_user_mode);
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static void setup_addressing_mode(void)
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{
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if (user_mode == PRIMARY_SPACE_MODE) {
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if (set_amode_primary())
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pr_info("Address spaces switched, "
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"mvcos available\n");
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else
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pr_info("Address spaces switched, "
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"mvcos not available\n");
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}
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}
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static void __init
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setup_lowcore(void)
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{
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struct _lowcore *lc;
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/*
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* Setup lowcore for boot cpu
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*/
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BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
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lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
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lc->restart_psw.mask = psw_kernel_bits;
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lc->restart_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
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lc->external_new_psw.mask = psw_kernel_bits |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->external_new_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
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lc->svc_new_psw.mask = psw_kernel_bits |
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PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
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lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
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lc->program_new_psw.mask = psw_kernel_bits |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->program_new_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
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lc->mcck_new_psw.mask = psw_kernel_bits;
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lc->mcck_new_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
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lc->io_new_psw.mask = psw_kernel_bits |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
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lc->clock_comparator = -1ULL;
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lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
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lc->async_stack = (unsigned long)
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__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
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lc->panic_stack = (unsigned long)
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__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
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lc->current_task = (unsigned long) init_thread_union.thread_info.task;
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lc->thread_info = (unsigned long) &init_thread_union;
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lc->machine_flags = S390_lowcore.machine_flags;
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lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
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memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
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MAX_FACILITY_BIT/8);
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#ifndef CONFIG_64BIT
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if (MACHINE_HAS_IEEE) {
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lc->extended_save_area_addr = (__u32)
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__alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
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/* enable extended save area */
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__ctl_set_bit(14, 29);
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}
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#else
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lc->cmf_hpp = -1ULL;
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lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
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#endif
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lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
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lc->async_enter_timer = S390_lowcore.async_enter_timer;
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lc->exit_timer = S390_lowcore.exit_timer;
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lc->user_timer = S390_lowcore.user_timer;
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lc->system_timer = S390_lowcore.system_timer;
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lc->steal_timer = S390_lowcore.steal_timer;
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lc->last_update_timer = S390_lowcore.last_update_timer;
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lc->last_update_clock = S390_lowcore.last_update_clock;
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lc->ftrace_func = S390_lowcore.ftrace_func;
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set_prefix((u32)(unsigned long) lc);
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lowcore_ptr[0] = lc;
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}
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static struct resource code_resource = {
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.name = "Kernel code",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource data_resource = {
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.name = "Kernel data",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource bss_resource = {
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.name = "Kernel bss",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource __initdata *standard_resources[] = {
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&code_resource,
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&data_resource,
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&bss_resource,
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};
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static void __init setup_resources(void)
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{
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struct resource *res, *std_res, *sub_res;
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int i, j;
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code_resource.start = (unsigned long) &_text;
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code_resource.end = (unsigned long) &_etext - 1;
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data_resource.start = (unsigned long) &_etext;
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data_resource.end = (unsigned long) &_edata - 1;
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bss_resource.start = (unsigned long) &__bss_start;
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bss_resource.end = (unsigned long) &__bss_stop - 1;
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for (i = 0; i < MEMORY_CHUNKS; i++) {
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if (!memory_chunk[i].size)
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continue;
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if (memory_chunk[i].type == CHUNK_OLDMEM ||
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memory_chunk[i].type == CHUNK_CRASHK)
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continue;
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res = alloc_bootmem_low(sizeof(*res));
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res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
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switch (memory_chunk[i].type) {
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case CHUNK_READ_WRITE:
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case CHUNK_CRASHK:
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res->name = "System RAM";
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break;
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case CHUNK_READ_ONLY:
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res->name = "System ROM";
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res->flags |= IORESOURCE_READONLY;
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break;
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default:
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res->name = "reserved";
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}
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res->start = memory_chunk[i].addr;
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res->end = res->start + memory_chunk[i].size - 1;
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request_resource(&iomem_resource, res);
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for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
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std_res = standard_resources[j];
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if (std_res->start < res->start ||
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std_res->start > res->end)
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continue;
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if (std_res->end > res->end) {
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sub_res = alloc_bootmem_low(sizeof(*sub_res));
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*sub_res = *std_res;
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sub_res->end = res->end;
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std_res->start = res->end + 1;
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request_resource(res, sub_res);
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} else {
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request_resource(res, std_res);
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}
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}
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}
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}
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|
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unsigned long real_memory_size;
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EXPORT_SYMBOL_GPL(real_memory_size);
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|
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static void __init setup_memory_end(void)
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{
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unsigned long memory_size;
|
|
unsigned long max_mem;
|
|
int i;
|
|
|
|
|
|
#ifdef CONFIG_ZFCPDUMP
|
|
if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
|
|
memory_end = ZFCPDUMP_HSA_SIZE;
|
|
memory_end_set = 1;
|
|
}
|
|
#endif
|
|
memory_size = 0;
|
|
memory_end &= PAGE_MASK;
|
|
|
|
max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
|
|
memory_end = min(max_mem, memory_end);
|
|
|
|
/*
|
|
* Make sure all chunks are MAX_ORDER aligned so we don't need the
|
|
* extra checks that HOLES_IN_ZONE would require.
|
|
*/
|
|
for (i = 0; i < MEMORY_CHUNKS; i++) {
|
|
unsigned long start, end;
|
|
struct mem_chunk *chunk;
|
|
unsigned long align;
|
|
|
|
chunk = &memory_chunk[i];
|
|
align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
|
|
start = (chunk->addr + align - 1) & ~(align - 1);
|
|
end = (chunk->addr + chunk->size) & ~(align - 1);
|
|
if (start >= end)
|
|
memset(chunk, 0, sizeof(*chunk));
|
|
else {
|
|
chunk->addr = start;
|
|
chunk->size = end - start;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < MEMORY_CHUNKS; i++) {
|
|
struct mem_chunk *chunk = &memory_chunk[i];
|
|
|
|
real_memory_size = max(real_memory_size,
|
|
chunk->addr + chunk->size);
|
|
if (chunk->addr >= max_mem) {
|
|
memset(chunk, 0, sizeof(*chunk));
|
|
continue;
|
|
}
|
|
if (chunk->addr + chunk->size > max_mem)
|
|
chunk->size = max_mem - chunk->addr;
|
|
memory_size = max(memory_size, chunk->addr + chunk->size);
|
|
}
|
|
if (!memory_end)
|
|
memory_end = memory_size;
|
|
}
|
|
|
|
void *restart_stack __attribute__((__section__(".data")));
|
|
|
|
/*
|
|
* Setup new PSW and allocate stack for PSW restart interrupt
|
|
*/
|
|
static void __init setup_restart_psw(void)
|
|
{
|
|
psw_t psw;
|
|
|
|
restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
|
|
restart_stack += ASYNC_SIZE;
|
|
|
|
/*
|
|
* Setup restart PSW for absolute zero lowcore. This is necesary
|
|
* if PSW restart is done on an offline CPU that has lowcore zero
|
|
*/
|
|
psw.mask = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
|
|
psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
|
|
copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
|
|
}
|
|
|
|
static void __init setup_vmcoreinfo(void)
|
|
{
|
|
#ifdef CONFIG_KEXEC
|
|
unsigned long ptr = paddr_vmcoreinfo_note();
|
|
|
|
copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
|
|
/*
|
|
* Find suitable location for crashkernel memory
|
|
*/
|
|
static unsigned long __init find_crash_base(unsigned long crash_size,
|
|
char **msg)
|
|
{
|
|
unsigned long crash_base;
|
|
struct mem_chunk *chunk;
|
|
int i;
|
|
|
|
if (memory_chunk[0].size < crash_size) {
|
|
*msg = "first memory chunk must be at least crashkernel size";
|
|
return 0;
|
|
}
|
|
if (is_kdump_kernel() && (crash_size == OLDMEM_SIZE))
|
|
return OLDMEM_BASE;
|
|
|
|
for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
|
|
chunk = &memory_chunk[i];
|
|
if (chunk->size == 0)
|
|
continue;
|
|
if (chunk->type != CHUNK_READ_WRITE)
|
|
continue;
|
|
if (chunk->size < crash_size)
|
|
continue;
|
|
crash_base = (chunk->addr + chunk->size) - crash_size;
|
|
if (crash_base < crash_size)
|
|
continue;
|
|
if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
|
|
continue;
|
|
if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
|
|
continue;
|
|
return crash_base;
|
|
}
|
|
*msg = "no suitable area found";
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if crash_base and crash_size is valid
|
|
*/
|
|
static int __init verify_crash_base(unsigned long crash_base,
|
|
unsigned long crash_size,
|
|
char **msg)
|
|
{
|
|
struct mem_chunk *chunk;
|
|
int i;
|
|
|
|
/*
|
|
* Because we do the swap to zero, we must have at least 'crash_size'
|
|
* bytes free space before crash_base
|
|
*/
|
|
if (crash_size > crash_base) {
|
|
*msg = "crashkernel offset must be greater than size";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* First memory chunk must be at least crash_size */
|
|
if (memory_chunk[0].size < crash_size) {
|
|
*msg = "first memory chunk must be at least crashkernel size";
|
|
return -EINVAL;
|
|
}
|
|
/* Check if we fit into the respective memory chunk */
|
|
for (i = 0; i < MEMORY_CHUNKS; i++) {
|
|
chunk = &memory_chunk[i];
|
|
if (chunk->size == 0)
|
|
continue;
|
|
if (crash_base < chunk->addr)
|
|
continue;
|
|
if (crash_base >= chunk->addr + chunk->size)
|
|
continue;
|
|
/* we have found the memory chunk */
|
|
if (crash_base + crash_size > chunk->addr + chunk->size) {
|
|
*msg = "selected memory chunk is too small for "
|
|
"crashkernel memory";
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
*msg = "invalid memory range specified";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Reserve kdump memory by creating a memory hole in the mem_chunk array
|
|
*/
|
|
static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
|
|
int type)
|
|
{
|
|
|
|
create_mem_hole(memory_chunk, addr, size, type);
|
|
}
|
|
|
|
/*
|
|
* When kdump is enabled, we have to ensure that no memory from
|
|
* the area [0 - crashkernel memory size] and
|
|
* [crashk_res.start - crashk_res.end] is set offline.
|
|
*/
|
|
static int kdump_mem_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct memory_notify *arg = data;
|
|
|
|
if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
|
|
return NOTIFY_BAD;
|
|
if (arg->start_pfn > PFN_DOWN(crashk_res.end))
|
|
return NOTIFY_OK;
|
|
if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
|
|
return NOTIFY_OK;
|
|
return NOTIFY_BAD;
|
|
}
|
|
|
|
static struct notifier_block kdump_mem_nb = {
|
|
.notifier_call = kdump_mem_notifier,
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Make sure that oldmem, where the dump is stored, is protected
|
|
*/
|
|
static void reserve_oldmem(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (!OLDMEM_BASE)
|
|
return;
|
|
|
|
reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
|
|
reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE,
|
|
CHUNK_OLDMEM);
|
|
if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size)
|
|
saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
|
|
else
|
|
saved_max_pfn = PFN_DOWN(real_memory_size) - 1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve memory for kdump kernel to be loaded with kexec
|
|
*/
|
|
static void __init reserve_crashkernel(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
unsigned long long crash_base, crash_size;
|
|
char *msg;
|
|
int rc;
|
|
|
|
rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
|
|
&crash_base);
|
|
if (rc || crash_size == 0)
|
|
return;
|
|
crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
|
|
crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
|
|
if (register_memory_notifier(&kdump_mem_nb))
|
|
return;
|
|
if (!crash_base)
|
|
crash_base = find_crash_base(crash_size, &msg);
|
|
if (!crash_base) {
|
|
pr_info("crashkernel reservation failed: %s\n", msg);
|
|
unregister_memory_notifier(&kdump_mem_nb);
|
|
return;
|
|
}
|
|
if (verify_crash_base(crash_base, crash_size, &msg)) {
|
|
pr_info("crashkernel reservation failed: %s\n", msg);
|
|
unregister_memory_notifier(&kdump_mem_nb);
|
|
return;
|
|
}
|
|
if (!OLDMEM_BASE && MACHINE_IS_VM)
|
|
diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
|
|
crashk_res.start = crash_base;
|
|
crashk_res.end = crash_base + crash_size - 1;
|
|
insert_resource(&iomem_resource, &crashk_res);
|
|
reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
|
|
pr_info("Reserving %lluMB of memory at %lluMB "
|
|
"for crashkernel (System RAM: %luMB)\n",
|
|
crash_size >> 20, crash_base >> 20, memory_end >> 20);
|
|
#endif
|
|
}
|
|
|
|
static void __init
|
|
setup_memory(void)
|
|
{
|
|
unsigned long bootmap_size;
|
|
unsigned long start_pfn, end_pfn;
|
|
int i;
|
|
|
|
/*
|
|
* partially used pages are not usable - thus
|
|
* we are rounding upwards:
|
|
*/
|
|
start_pfn = PFN_UP(__pa(&_end));
|
|
end_pfn = max_pfn = PFN_DOWN(memory_end);
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/*
|
|
* Move the initrd in case the bitmap of the bootmem allocater
|
|
* would overwrite it.
|
|
*/
|
|
|
|
if (INITRD_START && INITRD_SIZE) {
|
|
unsigned long bmap_size;
|
|
unsigned long start;
|
|
|
|
bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
|
|
bmap_size = PFN_PHYS(bmap_size);
|
|
|
|
if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
|
|
start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (OLDMEM_BASE) {
|
|
/* Move initrd behind kdump oldmem */
|
|
if (start + INITRD_SIZE > OLDMEM_BASE &&
|
|
start < OLDMEM_BASE + OLDMEM_SIZE)
|
|
start = OLDMEM_BASE + OLDMEM_SIZE;
|
|
}
|
|
#endif
|
|
if (start + INITRD_SIZE > memory_end) {
|
|
pr_err("initrd extends beyond end of "
|
|
"memory (0x%08lx > 0x%08lx) "
|
|
"disabling initrd\n",
|
|
start + INITRD_SIZE, memory_end);
|
|
INITRD_START = INITRD_SIZE = 0;
|
|
} else {
|
|
pr_info("Moving initrd (0x%08lx -> "
|
|
"0x%08lx, size: %ld)\n",
|
|
INITRD_START, start, INITRD_SIZE);
|
|
memmove((void *) start, (void *) INITRD_START,
|
|
INITRD_SIZE);
|
|
INITRD_START = start;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Initialize the boot-time allocator
|
|
*/
|
|
bootmap_size = init_bootmem(start_pfn, end_pfn);
|
|
|
|
/*
|
|
* Register RAM areas with the bootmem allocator.
|
|
*/
|
|
|
|
for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
|
|
unsigned long start_chunk, end_chunk, pfn;
|
|
|
|
if (memory_chunk[i].type != CHUNK_READ_WRITE &&
|
|
memory_chunk[i].type != CHUNK_CRASHK)
|
|
continue;
|
|
start_chunk = PFN_DOWN(memory_chunk[i].addr);
|
|
end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
|
|
end_chunk = min(end_chunk, end_pfn);
|
|
if (start_chunk >= end_chunk)
|
|
continue;
|
|
add_active_range(0, start_chunk, end_chunk);
|
|
pfn = max(start_chunk, start_pfn);
|
|
for (; pfn < end_chunk; pfn++)
|
|
page_set_storage_key(PFN_PHYS(pfn),
|
|
PAGE_DEFAULT_KEY, 0);
|
|
}
|
|
|
|
psw_set_key(PAGE_DEFAULT_KEY);
|
|
|
|
free_bootmem_with_active_regions(0, max_pfn);
|
|
|
|
/*
|
|
* Reserve memory used for lowcore/command line/kernel image.
|
|
*/
|
|
reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
|
|
reserve_bootmem((unsigned long)_stext,
|
|
PFN_PHYS(start_pfn) - (unsigned long)_stext,
|
|
BOOTMEM_DEFAULT);
|
|
/*
|
|
* Reserve the bootmem bitmap itself as well. We do this in two
|
|
* steps (first step was init_bootmem()) because this catches
|
|
* the (very unlikely) case of us accidentally initializing the
|
|
* bootmem allocator with an invalid RAM area.
|
|
*/
|
|
reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
|
|
BOOTMEM_DEFAULT);
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (crashk_res.start)
|
|
reserve_bootmem(crashk_res.start,
|
|
crashk_res.end - crashk_res.start + 1,
|
|
BOOTMEM_DEFAULT);
|
|
if (is_kdump_kernel())
|
|
reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
|
|
PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
|
|
#endif
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (INITRD_START && INITRD_SIZE) {
|
|
if (INITRD_START + INITRD_SIZE <= memory_end) {
|
|
reserve_bootmem(INITRD_START, INITRD_SIZE,
|
|
BOOTMEM_DEFAULT);
|
|
initrd_start = INITRD_START;
|
|
initrd_end = initrd_start + INITRD_SIZE;
|
|
} else {
|
|
pr_err("initrd extends beyond end of "
|
|
"memory (0x%08lx > 0x%08lx) "
|
|
"disabling initrd\n",
|
|
initrd_start + INITRD_SIZE, memory_end);
|
|
initrd_start = initrd_end = 0;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Setup hardware capabilities.
|
|
*/
|
|
static void __init setup_hwcaps(void)
|
|
{
|
|
static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
|
|
struct cpuid cpu_id;
|
|
int i;
|
|
|
|
/*
|
|
* The store facility list bits numbers as found in the principles
|
|
* of operation are numbered with bit 1UL<<31 as number 0 to
|
|
* bit 1UL<<0 as number 31.
|
|
* Bit 0: instructions named N3, "backported" to esa-mode
|
|
* Bit 2: z/Architecture mode is active
|
|
* Bit 7: the store-facility-list-extended facility is installed
|
|
* Bit 17: the message-security assist is installed
|
|
* Bit 19: the long-displacement facility is installed
|
|
* Bit 21: the extended-immediate facility is installed
|
|
* Bit 22: extended-translation facility 3 is installed
|
|
* Bit 30: extended-translation facility 3 enhancement facility
|
|
* These get translated to:
|
|
* HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
|
|
* HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
|
|
* HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
|
|
* HWCAP_S390_ETF3EH bit 8 (22 && 30).
|
|
*/
|
|
for (i = 0; i < 6; i++)
|
|
if (test_facility(stfl_bits[i]))
|
|
elf_hwcap |= 1UL << i;
|
|
|
|
if (test_facility(22) && test_facility(30))
|
|
elf_hwcap |= HWCAP_S390_ETF3EH;
|
|
|
|
/*
|
|
* Check for additional facilities with store-facility-list-extended.
|
|
* stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
|
|
* and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
|
|
* as stored by stfl, bits 32-xxx contain additional facilities.
|
|
* How many facility words are stored depends on the number of
|
|
* doublewords passed to the instruction. The additional facilities
|
|
* are:
|
|
* Bit 42: decimal floating point facility is installed
|
|
* Bit 44: perform floating point operation facility is installed
|
|
* translated to:
|
|
* HWCAP_S390_DFP bit 6 (42 && 44).
|
|
*/
|
|
if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
|
|
elf_hwcap |= HWCAP_S390_DFP;
|
|
|
|
/*
|
|
* Huge page support HWCAP_S390_HPAGE is bit 7.
|
|
*/
|
|
if (MACHINE_HAS_HPAGE)
|
|
elf_hwcap |= HWCAP_S390_HPAGE;
|
|
|
|
/*
|
|
* 64-bit register support for 31-bit processes
|
|
* HWCAP_S390_HIGH_GPRS is bit 9.
|
|
*/
|
|
elf_hwcap |= HWCAP_S390_HIGH_GPRS;
|
|
|
|
get_cpu_id(&cpu_id);
|
|
switch (cpu_id.machine) {
|
|
case 0x9672:
|
|
#if !defined(CONFIG_64BIT)
|
|
default: /* Use "g5" as default for 31 bit kernels. */
|
|
#endif
|
|
strcpy(elf_platform, "g5");
|
|
break;
|
|
case 0x2064:
|
|
case 0x2066:
|
|
#if defined(CONFIG_64BIT)
|
|
default: /* Use "z900" as default for 64 bit kernels. */
|
|
#endif
|
|
strcpy(elf_platform, "z900");
|
|
break;
|
|
case 0x2084:
|
|
case 0x2086:
|
|
strcpy(elf_platform, "z990");
|
|
break;
|
|
case 0x2094:
|
|
case 0x2096:
|
|
strcpy(elf_platform, "z9-109");
|
|
break;
|
|
case 0x2097:
|
|
case 0x2098:
|
|
strcpy(elf_platform, "z10");
|
|
break;
|
|
case 0x2817:
|
|
case 0x2818:
|
|
strcpy(elf_platform, "z196");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup function called from init/main.c just after the banner
|
|
* was printed.
|
|
*/
|
|
|
|
void __init
|
|
setup_arch(char **cmdline_p)
|
|
{
|
|
/*
|
|
* print what head.S has found out about the machine
|
|
*/
|
|
#ifndef CONFIG_64BIT
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if (MACHINE_IS_VM)
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pr_info("Linux is running as a z/VM "
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"guest operating system in 31-bit mode\n");
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else if (MACHINE_IS_LPAR)
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pr_info("Linux is running natively in 31-bit mode\n");
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if (MACHINE_HAS_IEEE)
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pr_info("The hardware system has IEEE compatible "
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"floating point units\n");
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else
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pr_info("The hardware system has no IEEE compatible "
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"floating point units\n");
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#else /* CONFIG_64BIT */
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if (MACHINE_IS_VM)
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pr_info("Linux is running as a z/VM "
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|
"guest operating system in 64-bit mode\n");
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else if (MACHINE_IS_KVM)
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pr_info("Linux is running under KVM in 64-bit mode\n");
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else if (MACHINE_IS_LPAR)
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pr_info("Linux is running natively in 64-bit mode\n");
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#endif /* CONFIG_64BIT */
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/* Have one command line that is parsed and saved in /proc/cmdline */
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/* boot_command_line has been already set up in early.c */
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*cmdline_p = boot_command_line;
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ROOT_DEV = Root_RAM0;
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init_mm.start_code = PAGE_OFFSET;
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init_mm.end_code = (unsigned long) &_etext;
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init_mm.end_data = (unsigned long) &_edata;
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init_mm.brk = (unsigned long) &_end;
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if (MACHINE_HAS_MVCOS)
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memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
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else
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memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
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parse_early_param();
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setup_ipl();
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setup_memory_end();
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setup_addressing_mode();
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reserve_oldmem();
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reserve_crashkernel();
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setup_memory();
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setup_resources();
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|
setup_vmcoreinfo();
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|
setup_restart_psw();
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|
setup_lowcore();
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|
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cpu_init();
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|
s390_init_cpu_topology();
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|
|
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/*
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* Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
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|
*/
|
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setup_hwcaps();
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|
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/*
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* Create kernel page tables and switch to virtual addressing.
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|
*/
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|
paging_init();
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|
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/* Setup default console */
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|
conmode_default();
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|
set_preferred_console();
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|
|
|
/* Setup zfcpdump support */
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|
setup_zfcpdump(console_devno);
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}
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